let Socket = '';
let setIntervalWesocketPush = null;
let config = {
    url: '',
    to: '',
};

/**
 * 建立websocket连接
 * @param {string} url ws地址
 */
export const createSocket = (cfg) => {
    Socket && Socket.close();
    if (!cfg.url) {
        console.log('no url');
        return false;
    }
    /*if(!cfg.to){
        console.log('no to');
        return false;
    }*/
    if (!Socket) {
        config = cfg;
        // console.log('websocket link', config);
        Socket = new WebSocket(config.url);
        Socket.onopen = onopenWS;
        Socket.onmessage = onmessageWS;
        Socket.onerror = onerrorWS;
        Socket.onclose = oncloseWS;
    } else {
        console.log('websocket linked');
    }
};

/**
 * 打开WS之后发送心跳
 */
const onopenWS = () => {
    //sendPing(20000, JSON.stringify({type: 'ping', to: config.to}));
};

/**
 * 连接失败重连
 * */
const onerrorWS = () => {
    Socket.close();
    clearInterval(setIntervalWesocketPush);
    console.log('websocket error reload');
    if (Socket.readyState !== 3) {
        Socket = null;
        createSocket(config);
    }
};

/**
 * WS数据接收统一处理
 */
const onmessageWS = e => {
    window.dispatchEvent(new CustomEvent('onmessageWS', {
        detail: {
            data: e.data
        }
    }))
};

/**
 * 发送数据但连接未建立时进行处理等待重发
 * @param {any} message 需要发送的数据
 */
const connecting = message => {
    setTimeout(() => {
        if (Socket.readyState === 0) {
            connecting(message);
        } else {
            Socket.send(JSON.stringify(message));
        }
    }, 1000);
};

/**
 * 发送数据
 * @param {any} message 需要发送的数据
 */
export const sendWSPush = message => {
    if (Socket !== null && Socket.readyState === 3) {
        Socket.close();
        createSocket(config);
    } else if (Socket.readyState === 1) {
        Socket.send(JSON.stringify(message))
    } else if (Socket.readyState === 0) {
        connecting(message);
    }
};

/**
 * 断开重连
 */
const oncloseWS = () => {
    clearInterval(setIntervalWesocketPush);
    console.log('websocket close reload');
    if (Socket.readyState !== 2) {
        Socket = null;
        createSocket(config);
    }
};

/**发送心跳
 * @param {number} time 心跳间隔毫秒 默认5000
 * @param {string} ping 心跳名称 默认字符串ping
 */
export const sendPing = (time = 5000, ping = 'ping') => {
    clearInterval(setIntervalWesocketPush);
    Socket.send(ping);
    setIntervalWesocketPush = setInterval(() => {
        Socket.send(ping);
    }, time);
};

/**
 * 结束心跳
 */
export const endPing = () => {
    clearInterval(setIntervalWesocketPush);
};

/**
 * 关闭websocket
 */
export const closeSocket = () => {
    Socket.close();
};
